Initial import

third_party/duktape/duk_harray.h

@@ -0,0 +1,48 @@
+/*
+ *  Array object representation, used for actual Array instances.
+ *
+ *  All objects with the exotic array behavior (which must coincide with having
+ *  internal class array) MUST be duk_harrays.  No other object can be a
+ *  duk_harray.  However, duk_harrays may not always have an array part.
+ */
+
+#if !defined(DUK_HARRAY_H_INCLUDED)
+#define DUK_HARRAY_H_INCLUDED
+
+#if defined(DUK_USE_ASSERTIONS)
+DUK_INTERNAL_DECL void duk_harray_assert_valid(duk_harray *h);
+#define DUK_HARRAY_ASSERT_VALID(h)  do { duk_harray_assert_valid((h)); } while (0)
+#else
+#define DUK_HARRAY_ASSERT_VALID(h)  do {} while (0)
+#endif
+
+#define DUK_HARRAY_LENGTH_WRITABLE(h)         (!(h)->length_nonwritable)
+#define DUK_HARRAY_LENGTH_NONWRITABLE(h)      ((h)->length_nonwritable)
+#define DUK_HARRAY_SET_LENGTH_WRITABLE(h)     do { (h)->length_nonwritable = 0; } while (0)
+#define DUK_HARRAY_SET_LENGTH_NONWRITABLE(h)  do { (h)->length_nonwritable = 1; } while (0)
+
+struct duk_harray {
+	/* Shared object part. */
+	duk_hobject obj;
+
+	/* Array .length.
+	 *
+	 * At present Array .length may be smaller, equal, or even larger
+	 * than the allocated underlying array part.  Fast path code must
+	 * always take this into account carefully.
+	 */
+	duk_uint32_t length;
+
+	/* Array .length property attributes.  The property is always
+	 * non-enumerable and non-configurable.  It's initially writable
+	 * but per Object.defineProperty() rules it can be made non-writable
+	 * even if it is non-configurable.  Thus we need to track the
+	 * writability explicitly.
+	 *
+	 * XXX: this field to be eliminated and moved into duk_hobject
+	 * flags field to save space.
+	 */
+	duk_bool_t length_nonwritable;
+};
+
+#endif  /* DUK_HARRAY_H_INCLUDED */